Scsi Storage Enclosure Status; Scsi Storage Enclosure Inventory; Scsi Drive; Scsi Drive Status - HP Xw460c - ProLiant - Blade Workstation User Manual

SCSI Storage Enclosure Status

Transfers/Sec—The average number of transfers on this SCSI bus each second (the sum of the Disk
Transfers/Sec for all hard drives on this bus).
MBytes/Sec—The average number of megabytes transferred on this SCSI bus each second (the sum
of the Disk MBytes/Sec for all SCSI drives on this bus).
SCSI Utilization %—The average SCSI utilization for this SCSI bus, which is primarily dependent on
the MBytes/Sec, and the SCSI protocol negotiated between the controller and each drive on the bus.
The negotiated SCSI protocol is reported in the hard drive inventory. The valid SCSI protocols include:
SCSI- 1 -5 MB/s with 8-bit transfers at 5 MHz (5,000,000 bytes/s)
Fast SCSI-2- 10 MB/s with 8-bit transfers at 10 MHz (10,000,000 bytes/s)
Fast-Wide SCSI-2- 20 MB/s with 16-bit transfers at 10 MHz
Ultra SCSI-3- 20 MB/s with 8-bit transfers at 20 MHz
Wide-Ultra SCSI-3- 40 MB/s with 16-bit transfers at 20 MHz
Wide Ultra2 SCSI- 80 MB/s with 16-bit transfers at 40 MHz
Wide Ultra3 SCSI- 160 MB/s with 16-bit transfers at 80 MHz
Ultra320 SCSI- 320 MB/s with 16-bit transfers at 160 MHz
SCSI storage enclosure performance is determined by the SCSI Utilization %.

SCSI Storage Enclosure Inventory

Enclosure Configuration
The type or model of the storage enclosure
Which SCSI protocol is supported by the storage enclosure
The number of drive bays provided by the storage enclosure
The number of SCSI drives installed in the storage enclosure
The SCSI adapter attached to the storage enclosure and the port on the adapter

SCSI drive

The following information is provided for a SCSI drive.

SCSI Drive Status

Disk Reads/Sec—The average number of reads from the selected SCSI drive each second
Disk Writes/Sec—The average number of writes to the selected SCSI drive each second
Disk Read MBytes/Sec—The average number of megabytes read from the selected SCSI drive each
second
Disk Write MBytes/Sec—The average number of megabytes written to the selected SCSI drive each
second
Disk Millisec/Read—The average time required to complete a read
Disk Millisec/Write—The average time required to complete a write
Disk Queue Length—The average number of transfer requests (reads and writes) waiting to be serviced
by the SCSI drive, including transfers currently being serviced and transfers waiting for service, regardless
of where the request is waiting (drive or controller)
PMP uses a set of algorithms to determine SCSI drive status. In general, the Disk Queue Length is a primary
parameter. When the value of the Disk Queue Length exceeds an acceptable value, the Disk Reads/Sec
and Writes/Sec are examined to determine whether read or write operations are requiring most of the drive
throughput. When combined with Disk Millisec/Read or Write, PMP can determine if the number of requests
for the drive is exceeding the capabilities of the drive.
SCSI drive 163